Elevated drafting-rule.



A. E. ANDERSON.

ELEVATED DRAFTING RULE.

APPLICATION nusn MAR- 10. I916- Patented Jail. 30, 1917.

VENTOR.

BY 51 JK ATTORNEYS.

IN] FM IN ELEVATED DRAFTING-RULE.

Specification of Letters Patent.

Patented Jan. 3d, Twit.

Application filed March 10, 1916. Serial No. 83,282.

To whom it may concern Be it known that T, ANnnnw l1l.-;\1 vo r:n- SON,a citizen of the United States, residing at Brownsville, in the countyof Cameron and State of Texas, have invented certain new and usefulImprovements in Elevated Drafting-Rules, of which the following is aspecification.

This invention relates to new and, useful improvements in an instrumentfor the rule from the drawing, said ruling edge or straight edge may beraised and shifted to a new position without the danger of its smearingthe undried ink underneath; to provide a drafting rule, which, whenbeing shifted or slid over the surface of the drawing, will be incontact with said surface at only four places, each of almost negligiblearea, thus preventing the drawing paper or cloth from being rubbed andsoiled as when an ordinary triangle or rule is used; to provide inconnection with the straight edge of said rule, means of pressing andholding the drawing paper or cloth firmly against the surface of thedrafting table or board, immediately at each end of the line to be ruledand thus procuring a firm surface upon which to draw; and by the samemeans to provide against the tendency of the rule to slip when in use,caused by the pressure of the pen or pencil or other instrument upon thestraight edge of the rule.

l l ith the above and other objects in view the invention has particularrelation to cer' tain novel features of construction, operation andarrangement of parts. an example of which is given in this specificationand illustrated in the accompanying drawing, wherein Figure 1 is aperspective View of the rule, Fig. 2 is a top plan view, Fig. 3 is abottom plan view, Fig. 4 is a transverse sectional view taken on theline aa of Figs. 2 and 3, Fig. 5 is a transverse sectional view taken onthe line b-b of Figs. 2 and 3, and Fig. (3 is a. longitudinal sectionalview taken on the line 0-0 of Figs. 2 and 3.

Referring now more particularly to the drawings wherein like numerals ofreference designate similar parts in each of the figures the numeral 1refers to the rule proper and is a rectangular body preferably formed ofglass or some other suitable rigid transparent material and which hasthe straight edge 2. Metallic plates 3 and 4 are crimped over therespective ends of this rule and upstanding from the former of which isthe knob 5 by means of which the rule may be lifted and moved. An oblonggroove (5 extends from end to end of the rule along its upper side andnear the edge opposite the straight edge 2 and parallel with saidstraight edge 2, and slidable in this groove is the guide 7, upstandingfrom which is the pin 8 by means of which said guide may be moved backand forth in said groove; and a flexible strap 9 is integral, at oneend, with said guide and is bent around underneath the rule and restsclosely against the under side thereof, its free end extending asclosely as may be to the straight edge 2 of the rule, the bent portionof said flexible strap 9 forming a sprin of suflicient strength to holdsaid guide% snugly in the groove 6. The ends of the plates 3 and 4adjacent to the straight edge and the corresponding end of the strap 9are deflexed underneath, the bent back portions being bifurcated formingfingers as 10, 10, which diverge as shown in Fig. 3, and rubber tips 11are secured between said fingers. At the opposite ends of the plates 3and 4, and depending therefrom, are the supporting legs 12 and 13,spaced apart and having smooth rounded ends, the former of which areslightly longer than the latter so that when said legs 13 are touchingupon a plane surface the rubber tips will be elevated slightly above thesurface. Thus when an ink drawing is being made the rule can be slid onthe legs 12 and 13 and the straight edge 2 brought to another positionwithout smearing the undried ink with the rubber tips. The work can thusproceed without waiting for the ink to dry thereby saving a great dealof time.

When the rule has been moved lllltll the straight edge 2 is in positionto rule the line to be drawn a slight pressure on the rubber tips 11will operate to press the paper or other drawing surface flatly againstthe surface of drafting table or other sustaining surface, thus insuringa solid surface upon which to draw, and at the same time said tips 11being of rubber prevent the rule from slipping as it would have atendency to do, because of the pressure of the pen or pencil or otherdrawing instrument against the straight edge. 7

The central rubber tip on the flexible strap 9 is arranged to belaterally adjustable for the ruling of lines of varying lengths so thatsaid central rubber tip and one of the other rubber tips will insurecontact of drawing surface to sustaining surface underneath immediatelyat each end of the line to be drawn.

A rule of this character is specially adaptable for use in the draftingof small figures where short divergent lines are being drawn in ink andis more or less useful in various other kinds of drafting work.

What I claim is:

1. A. rule consisting of an oblong body having a straight edge,supporting legs depending therefrom which, when resting upon a planesurface, hold said straight edge above the said surface, one of saidlegs being movable lengthwise relative to the rule.

2. A rule consisting of an oblong body having a straight edge,supporting legs depending therefrom, whieh, when resting upon a planesurface, hold said straight edge spaced above the surface, spacersdepending from the rule underneath said straight edge, and an upstandingknob carried by the rule.

3. A rule consisting of an oblong body 7 having a straight edge,supporting legs depending therefrom, which, when resting upon a planesurface, hold said straight edge spaced above the surface, and spacersdepending from the rule underneath said siglaight edge, one of saidspacers being mova e.

' 4. A rule consisting of an oblong member having a straight edge,supporting legs depending therefrom and spaced apart, and also spacedfrom said-"straight edge and a spacer depending from the rule underneaththe straight edge.

5. A rule consisting of an oblong member having a straight edge,supporting legs depending therefrom and spaced apart, and also spacedfrom said straight edge and a plurality of spacers depending from therule underneath said straight edge, one of which is movable.

6. A rule consisting of an oblong member having a straight edge and alengthwise groove, metallic plates secured to the respective ends of'the rule, a guide slidable in said grooves, a strap integral with theguide and whose free end extends underneath the straight edge, spacersarranged underneath the straight edge and depending from said plates andstrap respectively, the latter of which is movable and a pair ofdepending legs arranged at each end of the rule and integral with. thecorresponding plates and spaced from said straight edge.

In testimony whereof I havesigned my name to this specification in thepresence of two subscribing witnesses.

ANDREW E. ANDERSON.

Witnesses:

DAVID H. Snoss, ARTHUR BLANCO.

